00870cam a22002411  4500001001300000003000400013005001700017008004100034010001700075035001900092040004000111042001200151050001500163100005800178245008000236260004400316300006500360500001700425500010300442650003800545650002800583999001700611gs 06001021 DLC20260227111304.0770117s1892    dcua         f000 0 eng c  ags 06001021   a(OCoLC)2683129  aU.S. Geol. survey. Lib.cWKenUdDLC  apremarc00aQE656b.W21 aWalcott, Charles D.q(Charles Doolittle),d1850-1927.14aThe North American continent during Cambrian time /cby Charles D. Walcott.  aWashington,bGov't. print. off.,c1892.  a523-568 p.bpl. XLII-XLV (incl. double maps) diagrs.c31 cm.  aCover title.  aExtract from the 12th annual report of the director of the U.S. Geological survey, 1890-91, pt. I. 0aGeology, StratigraphicyCambrian. 0aGeologyzNorth America.  c24497d24497